The diffraction of a crystal of Barium with X-ray of wavelength 2.29 gives a first order reflection at
. What is the distance (in
) between the diffracting planes ?
1.46
1.5
2.51
5.46
Bragg’s Equation
This equation gives a simple relationship between the wavelength Of X-rays and the distance between the planes in the crystal and the angle Of reflection. This equation can be written as:
As for a given set of lattice planes the value of 'd' is fixed so the possibility of getting maximum reflection depends only on θ. If we increase θ gradually a number of positions will be observed at which there will be maximum reflection.
Now,
So,